New TTS model
Our new Text-to-Speech model is now the default, with more expressive speech and lower latency. Existing requests using
default use the new model without a setup change.gradium-tts-beta also routes to this model until the next TTS beta arrives. Keep that alias to follow future betas, or use default to stay on stable releases.cfg_coef is deprecated for TTS. Requests that include it are still accepted, but the new model ignores its value. Remove it from json_config. See Model selection and Voice Settings.Voice Enhance (beta)
Clean up a voice you already have without changing its language or who is speaking.
POST /voice-generator/enhance takes a flagship voice, a clone or a candidate and returns candidates with background noise reduced. Audition and convert them like Voice Design candidates.Voice Enhance is in beta; output quality will keep improving. See the Voice Enhance guide to get started.New TTS public beta
Our new Text-to-Speech model entered public beta with lower latency and more expressive speech. At beta launch, we measured time to first audio under 50 ms, against 225 ms for the then-production model. Latency varies with network conditions and input.During the beta, setting
model_name to "gradium-tts-beta" selected the new model. Requests using default stayed on the previous production model. See the September 30 release above for the current default.The beta ignored cfg_coef: requests that included it were accepted, but it did not adjust voice similarity. See Voice Settings for current TTS settings.ISO 27001 certification
Gradium has achieved ISO 27001 certification, independently audited by A-LIGN.Visit our Trust Center for certification details and security documentation.
Studio improvements
Studio has a redesigned voice catalogue, new voice search controls in Text-to-Speech, and more ways to preview voices in Voice Design.
- Voice catalogue: Customize layout between tile or list views, group voices by language, and choose which properties to display. Studio saves your display preferences, and voice type labels distinguish catalogue, generated and cloned voices.
- Filters and insights: Narrow the catalogue by language, accent, age, gender and other voice attributes. Click a bar in the insights panel to filter the results, or copy a link to share a filtered view.
- Voice details: Open a voice’s details beside the catalogue. For your own voices, edit the name and properties directly in the panel. For catalog voices, browse the voice attributes.
- TTS voice selection: Search and filter voices in a dedicated side panel. Describe what you need, such as “French Parisian voice”, to get suggested smart filters. If nothing matches, Studio suggests a prompt you can take into Voice Design.
- Voice Design previews: Try a voice with three sample texts provided by default, regenerate the audio, and choose a different sample rate to hear how it sounds at your target rate.
- Voice Cloning: Find Instant and Pro cloning under one entry. Short recordings and upload errors are reported in the capture step.
- Updated typography: Studio uses a new typeface for improved readability.
Voice Design
Create a voice from a written description, no audio sample needed. Describe the accent, age and character you need, generate up to five candidates, and keep your favourite. The voice works with the same Text-to-Speech endpoint as any catalogue voice.In our blind listening evaluation, native speakers judged how well voices matched accent prompts. Gradium achieved a 72.6% win rate against ElevenLabs, Inworld, MiniMax and Fish Audio, counting ties as half a win, and ranked first in English, French, Spanish, Portuguese and German.See the Voice Design guide to get started.